Is it possible to improve performance of the Kron operator by making it a built in function rather than using m-file implementation?

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MathWorks Support Team
编辑： MathWorks Support Team 2021-4-19
I use the kron operator as well as row-wise and column-wise Kronecker operators extensively in my work and in packages I write in Matlab. Given the importance of these operators it would be nice to have intrinsic functions rather than m-files implementations. For years I have relied on MEX file versions that I wrote which can be hundreds of times faster than the m-file versions, especially for sparse matrices. I would like you to consider providing intrincis versions of these operators. I've attached my MEX file versions which you are welcome to use.

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采纳的回答

MathWorks Support Team
The functionality requested is currently unavailable in MATLAB. This has been forwarded to our Developers as an enhancement request.
  2 个评论
Matt J
Matt J 2020-4-29
Fabricius Somogyi's comment moved here:
Unfortunately I cannot find the MEX files that you attached in this thread. Could you kindly re-attach them? I am having similar issues with kron() being too slow for my purposes. Thanks!

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更多回答（1 个）

Matt J
Matt J 2014-1-9
编辑：MathWorks Support Team 2021-4-19
I wouldn't expect an intrinsic implementation to improve much. Most of the computational intensity of KRON is in all the multiplication operations required and those are well-accelerated through calls to BSXFUN.
Also, there are many operations involving Kronecker product matrices that are more efficiently done without computing the product explicitly with KRON. See here for a tool that facilitates this,
https://www.mathworks.com/matlabcentral/fileexchange/25969-efficient-object-oriented-kronecker-product-manipulation

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